Collection: Coffee filters

Coffee filters are an essential part of most brewing methods — from classic automatic drip machines to manual pour over drippers. The right filter traps the grounds and fine coffee particles, producing a clear brew free of unwanted sediment. Beyond clarity, the type of filter you choose has a meaningful impact on flavour, aroma, and body.

There are three main types of coffee filter: paper, metal, and cloth. Each works differently and produces a noticeably different result in the cup.

Paper filters are the most widely used option, particularly in pour over and drip brewing. Made from densely woven cellulose, they trap both coffee grounds and the natural oils present in coffee, producing a brew that is exceptionally clean and clear, with a light, delicate body. With the oils removed, brighter and fruitier notes tend to come through more clearly. The tradeoff is a slight reduction in aromatic depth — paper-filtered coffee is often described as clean and crisp, but less full-bodied than other methods.

Paper filters also capture diterpenes (cafestol and kahweol) — compounds found in coffee oils associated with raising LDL cholesterol levels. For this reason, paper-filtered coffee is generally considered the better choice for those monitoring their cholesterol.

Metal filters — most commonly stainless steel, though titanium and gold-plated versions also exist — are a reusable alternative to paper. The fine mesh stops larger coffee particles but allows the natural oils and fine micro-grounds to pass through into the cup. The result is a noticeably fuller brew: richer body, more texture, and a heavier feel on the palate — sometimes with a small amount of sediment at the bottom of the cup. Because the oils are present, aromatic intensity is also higher; those compounds carry a wide range of fragrance notes, from floral to nutty. The oils also soften the perception of acidity, making the cup feel rounder overall.

If you prefer a bold, full-bodied brew with depth and intensity, a metal filter is the better fit.

Cloth filters — typically made from cotton or linen — sit between paper and metal in terms of what they let through. The fabric traps most coffee particles, including very fine ones, but only partially absorbs the oils. In practice, cloth-filtered coffee is clean and sediment-free like a paper brew, but retains enough oil to add body and aromatic richness. The result is a cup that is full in flavour and body, yet still clear and transparent — without cloudiness or heaviness. Acidity remains present but is gently balanced by the oils. The exact outcome depends on the specific coffee and the density of the cloth.

Paper filters are simple, but a few details are worth understanding — the type of paper (bleached or unbleached) and the filter's construction both have a real effect on the brew.

Bleached vs. Unbleached Filters

The colour of a paper filter reflects how it was processed. White bleached filters are treated during production — either with chlorine or by an oxygen-based method. Brown unbleached filters are simply natural paper with no bleaching treatment. The differences are subtle but worth knowing.

• Effect on flavour. The main advantage of bleached filters is neutrality — they contribute less of a papery taste to the brew, because most of the lignin (the compound that gives paper its natural brown colour and woody smell) has been removed during bleaching.
• Ecology and production. Unbleached filters are generally considered the more environmentally straightforward option, as their production avoids bleaching chemicals. Bleached filters do require chemical treatment, though many manufacturers use chlorine-free methods. Both white and brown paper filters are compostable.